update: fix page number and refers original sample code

[hurutoriya]

What

• Fix page number. I have this book and I suppose the page number is 204.
• refers to the original sample code. https://github.com/mattn/aozora-search

Why

It is very interesting! Thank you for a good example

https://github.com/ikawaha/kagome/blob/v2/sample/_example/db_search/main.go

I found a some improvement points.

[ikawaha]

Nice catch! Thank you!

[KEINOS]

Oops! The page number was from the e-book! I should have notice! (//∇//) Thanks for the fix and the link!